Harry S. Truman Announces the Truman Doctrine to Congress Ca. 1947

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- 1947

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On March 12, 1947, President Harry S. Truman announced the Truman Doctrine to Congress, pledging to support Greece and Turkey against encroachment by the Soviet Union. The Truman Doctrine, which stated that the United States would support the efforts of noncommunist countries to resist the influence of the Soviet Union, became a crucial component of the cold war. Containment of communism was eventually used as justification for the Vietnam War.